Remove duplicates

channels/cn.m3u

@@ -878,8 +878,6 @@ http://live3.plus.hebtv.com/hbdsx/playlist.m3u8
 #EXTINF:-1 tvg-id="HeNanWeiShi.cn" tvg-country="CN" tvg-language="Chinese" tvg-logo="http://s.wasu.cn/data/images/201511/20/564ebd72d9f07.png" group-title="",河南卫视 [Offline]
 http://112.17.40.140/PLTV/88888888/224/3221226130/index.m3u8
 #EXTINF:-1 tvg-id="HeNanWeiShi.cn" tvg-country="CN" tvg-language="Chinese" tvg-logo="http://s.wasu.cn/data/images/201511/20/564ebd72d9f07.png" group-title="",河南卫视 [Offline]
-http://112.17.40.140/PLTV/88888888/224/3221226130/index.m3u8
-#EXTINF:-1 tvg-id="HeNanWeiShi.cn" tvg-country="CN" tvg-language="Chinese" tvg-logo="http://s.wasu.cn/data/images/201511/20/564ebd72d9f07.png" group-title="",河南卫视 [Offline]
 http://ivi.bupt.edu.cn/hls/hntv.m3u8
 #EXTINF:-1 tvg-id="HeNanMinSheng.cn" tvg-country="CN" tvg-language="Chinese" tvg-logo="" group-title="",河南民生 [Offline]
 http://117.158.206.60:9080/live/live29_tzwj_500k.m3u8